Insulating-lining for incandescent-lamp sockets.



No. 692,700. Patented Feb. 4, I902.

r H. T. PAISTE. INSULATING LINING FOR INCAND E SGENT LAMP SOCKETS.

(Application filed June 8, 1901.) v

(No Model.)

UNITED TATES ATENT FFICE,

INSULATING-LINING FOR lNCANDESCENT-LAMP SOCKETS.

SPECIFICATION formingpart of Letters Patent N o. 692,700, dated February 4, 1902.

Application filed June 8, 1901.

To a, whom it may concern:

Beit known thatI, HENRY T. PAISTE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Insulating-Linings for Incandescent-Lamp Sockets, of which the following is a specification.

My invention relates to certain improvements in insulating-linings for electric-lamp fixtures, and more particularly to an improved form of insulating shell or lining for incandescent-lamp sockets.

The object of my invention is to provide an insulatinglining for the interior of the brass shell which ordinarily forms the cover or support of alamp-socket, which shall be cheaper to manufacture and at the same time fit its brass shell more accurately than the insulating-bushings hitherto made. These objects I attain as hereinafter set forth, reference being bad to the accompanying drawings, in which Figure 1 is a plan view of the blank from which my insulating-shellis made. Fig. 2 is a perspective View of a finished insulatingshell as it come from the forming-machine. Fig. 3 is a similar view of a shell, showing its vertical edges brought together in the position occupied when it is within a brass socketshell; and Fig. 4 is a vertical sectional view of my improved insulating-shell.

As hitherto manufactured insulating-bushings for lining the interior of incandescentlamp sockets have been formed from a cylindrical section of fiber tubing,this being forced, by means of a plunger, into a die which crimped or corrugated its lower half, so as to reduce its diameter while preserving a cylindrical form. The shell so formed consisted, therefore, of two cylindrical sectionsof different diameters connected by an inclined section forming a shoulder, and the smaller of these sections was necessarily quite rough in form, owing to the crimping. In addition to the rough appearance of this finished article the insulating tubing from which it was formed was, owing to difficulties incident to its manufacture, comparatively costly.

In my improved lining or shell I first, by means of any suitable machine,-stamp from a piece of sheet fiber a piece similar in form to that shown in-Fig. 1 at A. This piece is fierial No. 63,682. (No model.)

the approximate shape of an unrolled or developed lining or shell, being made with its bottom edge a slightly curved or bent,as illustrated-tl1at is to say, of such configuration that when the sheet is rolled up and formed the ends of said sheet will perfectly meet in a line. The edges a of the upper part of its ends are cut at right angles to the top edge a; but the edges (1 of the lower part of said ends are cut inwardly by an amount depending upon the diameter of the lower section of the finished shell. If desired, recesses a may be cut in the edges of the'sheet A at the same time that said sheet is stamped from the sheet of raw material. This sheet A is now placed application for United States Letters Patent underdate of March 18, 1901, Serial N o.51,683, allowed June 6, 1901, and by means of it is drawn and bent into the form shown in' Fig. 2, the plunger of said machine forming the lower section b of the lining or shell A as a perfectly-smooth cylinder, united to the upper section b by a smooth curved shoulder b As delivered from the forming-machine the shell springs apart, as'shown in Fig. 2; but when pressed into a brass socketshell its edges a a come together in a straight line, as indicated at a in Fig. 3.

It will thus be seen that by the use of sheet materiall am enabled to construct a shell or lining of a more perfect form and one which consequently occupies less space than has hitherto been the case in the art. In addition to this I utilize sheet fiber or other insulating substance in the manufacture of these linings, a form of raw material not hitherto practically available, although one which is die cidedly less costly than the fiber tubes formerly employed.

It has been found in use that my improved form of split insulating shell or lining is $11- perior to the tubular shell before used, as it can'be made to more accurately conform to the shape of the interior of a lamp-socket. Being perfectly smooth in outline, without wrinkles or corrugations, it occupies comparatively less space than the said tubular form of lining in a receptacle in which space is a valuable'consideration.

I claim as my invention-- 1. As a new article of manufacture, an illin a special machine, for which I have made sulating-shell for a lamp-socket having two connected cylindrical sections of different diameters, the same consisting of an elongated, rolled-up sheet of insulating material, one edge of said sheet being equal in length to the circumference of one section of the shell and the opposite edge of the sheet being continuous and. of such a length and configuration that when the sheet is rolled up and formed, the ends of said. sheet will perfectly meet in a line, substantially as described.

2. A blank from which an insulating-bushing is to be formed, the same consisting of a piece of sheet material, one edge thereof be- HENRY T. PAISTE.

Witnesses:

WILLIAM E. BRADLEY, Jos. I'I. KLEIN. 

